title: Mandibular kinematics after orthognathic surgical treatment a pilot study.
abstract: We recorded three-dimensional mandibular movements, while the mouth was being opened and closed, using an optoelectronic motion analyser in 14 patients (5 skeletal Class II, 9 skeletal Class III) who were being assessed 7-49 months after orthognathic operations, and in 44 healthy subjects. All 14 patients had satisfactory healing on clinical examination, and function had been restored. Mandibular movement was divided into its rotational and translational components. On maximum mouth opening, the patients had significantly less total displacement of the mandibular interincisor point (p=0.05), and more mandibular movement that was explained by pure condylar rotation (p=0.006), than control subjects. There was no significant relation between maximum mouth opening and percentage rotation. While mandibular motion was well restored clinically by orthognathic surgery, the kinematics of the joint were modified. Larger studies and longitudinal investigations are necessary to appreciate the clinical relevance of the variations in condylar rotational and translational components.
authors.affiliation: Functional Anatomy Research Center (FARC), Laboratorio di Anatomia Funzionale dell'Apparato Stomatognatico (LAFAS), Laboratorio di Anatomia Funzionale dell'Apparato Locomotore (LAFAL), Dipartimento di Morfologia Umana, Facoltà di Medicina e Chirurgia, Università degli Studi di Milano, Milano, Italy. chiarella.sforza@unimi.it <chiarella.sforza@unimi.it>
authors.forename: Chiarella
authors.initials: C
authors.lastname: Sforza
authors.forename: Alessandro
authors.initials: A
authors.lastname: Ugolini
authors.forename: Davide
authors.initials: D
authors.lastname: Rocchetta
authors.forename: Domenico
authors.initials: D
authors.lastname: Galante
authors.forename: Andrea
authors.initials: A
authors.lastname: Mapelli
authors.forename: Aldo Bruno
authors.initials: AB
authors.lastname: Giannì
mesh_terms: D000328:Adult; D001696:Biomechanical Phenomena; D016022:Case-Control Studies; D002508:Cephalometry; D005260:Female; D006801:Humans; D021621:Imaging, Three-Dimensional; D008297:Male; D008312:Malocclusion, Angle Class II / Q000601:surgery; D008313:Malocclusion, Angle Class III / Q000601:surgery; D008334:Mandible / Q000502:physiology*; D008954:Models, Biological; D009068:Movement; D056948:Orthognathic Surgical Procedures; D019340:Osteotomy, Le Fort; D010865:Pilot Projects; D011184:Postoperative Period; D016059:Range of Motion, Articular; D020127:Recovery of Function; D018709:Statistics, Nonparametric; D013704:Temporomandibular Joint / Q000502:physiology*; D016896:Treatment Outcome; D014716:Vertical Dimension; D055815:Young Adult